Articles that mention University of Freiburg -Optical Coherence Tomography News

University of Freiburg

0 Comments Leave a Comment

1-15 of 18 1 2 »
1. Mentioned In 18 Articles
2. Characterisation of vascular changes in different stages of Stargardt disease using double swept-source optical coherence tomography angiography
  
  Explore Home | BMJ Open Ophthalmology Nov 8 2019 Ophthalmology
  
  Objective To describe vascular changes in different stages of Stargardt disease (STGD) via double swept-source optical coherence tomography angiography. Methods and analysis Prospective, cross-sectional casecontrol study. Twenty-three patients (45 eyes) with ABCA4 mutations graded according to the Fishman STGD classification and 23 controls (23 eyes) were included. Two independent investigators quantified the foveal avascular zone (FAZ) in the superficial and deep capillary plexus (SCP/DCP) and the areas presenting rarefied ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg
3. Reduction of periodic noise in Fourier domain optical coherence tomography images by frequency domain filtering
  
  Explore Home Sep 1 2019
  
  In Fourier domain optical coherence tomography (FDOCT) coherence noise is caused by interference of light waves back-reflected or scattered from different spots within a measuring depth or from optical components within the OCT system such as a bended optical fibre. This coherence noise appears as periodic stripe patterns along the axial direction in resulting images. Background subtraction and physical segmentation are used to degrade the periodic coherence noise in previous ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg University of Lübeck
4. Intraoperative optical coherence tomography and ab interno trabecular meshwork surgery with the Trabectome
  
  Explore Medical Journals Publisher Sep 29 2017 Ophthalmology
  
  ...me,1 Amelie Pielen1 1University Eye Hospital, Medical School Hannover, Hannover, 2Eye Center, Medical Center, University of Freiburg, Freiburg, Germany Importance: This study is the first description of the use of the in...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg Carsten Framme Hannover Medical School
5. Value of Optical Coherence Tomography Angiography Imaging in Diagnosis and Treatment of Hemangioblastomas in von Hippel-Lindau Disease
  
  Explore Healio.com Oct 25 2016 Ophthalmology
  
  BACKGROUND AND OBJECTIVE: The introduction of optical coherence tomography angiography (OCTA) provides new insights into the retinal vasculature. The aim of this study was to explore the value of OCTA in imaging retinal hemangioblastomas and monitoring laser treatment in patients with von Hippel-Lindau (VHL) disease. PATIENTS AND METHODS: Ten eyes of 10 patients with VHL disease were included in this retrospective case series. All patients underwent complete ophthalmological work-up including ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg
6. Quasi-Bessel beams from asymmetric and astigmatic illumination sources
  
  Explore OSA | OSA Publishing Jul 24 2016
  
  We study the spatial intensity distribution and the self-reconstruction of quasi-Bessel beams produced from refractive axicon lenses with edge emitting laser diodes as asymmetric and astigmatic illumination sources. Comparing these to a symmetric mono-mode fiber source, we find that the asymmetry results in a transition of a quasi-Bessel beam into a bow-tie shaped pattern and eventually to a line shaped profile at a larger distance along the optical axis. Furthermore ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg
7. The APOSTEL recommendations for reporting quantitative optical coherence tomography studies
  
  Explore Neurology May 25 2016 Neurology , Ophthalmology
  
  Objective: To develop consensus recommendations for reporting of quantitative optical coherence tomography (OCT) study results. Methods: A panel of experienced OCT researchers (including 11 neurologists, 2 ophthalmologists, and 2 neuroscientists) discussed requirements for performing and reporting quantitative analyses of retinal morphology and developed a list of initial recommendations based on experience and previous studies. The list of recommendations was subsequently revised during several meetings of the coordinating group. Results: We ...
  Read Full Article
  
  Comment
  
  Mentions: Peter A. Calabresi Johns Hopkins University Joel S. Schuman
8. Bimodal endoscopic probe combining white-light microscopy and optical coherence tomography
  
  Explore OSA | OSA Publishing May 20 2016 Gastroenterology , Microscopy , Probes
  
  We present a novel bimodal endoscopic imaging probe that can simultaneously provide full-field white-light video microscopy and confocal optical coherence tomography (OCT) depth scans. The two modalities rely on spectrally separated optical paths that run partially in parallel through a micro-optical bench system, which has a cross-section of only 2 mm 2.76 mm and is realized via standard silicon micromachining techniques. With a numerical aperture of 0.061, the ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg
9. In vivo monitoring of glial scar proliferation on chronically implanted neural electrodes by fiber optical coherence tomography
  
  Explore journal.frontiersin.org Aug 10 2014 Neurology
  
  ...ronic Systems, University Medical Center Freiburg, Germany * ^2Department of Microsystems Engineering(IMTEK), University of Freiburg, Germany In neural prosthetics and stereotactic neurosurgery, intracortical elect...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg
10. Coronal in vivo forward-imaging of rat brain morphology with an ultra-small optical coherence tomography fiber probe
  
  Explore IOPscience Jan 16 2013 Neurology , Probes
  
  A well-established navigation method is one of the key conditions for successful brain surgery: it should be accurate, safe and online operable. Recent research shows that optical coherence tomography (OCT) is a potential solution for this application by providing a high resolution and small probe dimension. In this study a fiber-based spectral-domain OCT system utilizing a super-luminescent-diode with the center wavelength of 840 nm providing 14.5 m axial resolution ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg Gereon Hüttmann University of Lübeck
11. A Tunable Optofluidic Silicon Optical Bench
  
  Explore IEEE Xplore Nov 30 2012 Probes
  
  A miniaturized optical bench, based on silicon micromachining and with high modularity and flexibility, is presented. This optical microsystem integrates optics, fluidics, high-precision mechanics, and focal length tunable lenses and allows the realization of numerous optical arrangements, such as telephoto and retrofocus systems. Due to its dimensions, the technology may be used for designing a variety of endoscopic imaging probes, including those for optical coherence tomography. As the measuring beam ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg
12. Highly compact imaging using Bessel beams generated by ultraminiaturized multi-micro-axicon systems
  
  Explore opticsinfobase.org Apr 27 2012
  
  Employing Bessel beams in imaging takes advantage of their self-reconstructing properties to achieve small focal points while maintaining a large depth of focus. Bessel beams are efficiently generated using axicons, and their utility in scanning imaging systems, such as optical coherence tomography (OCT), has been demonstrated. As these systems are miniaturized to allow, for example, endoscopic implementations, micro-axicons are required to assure the maintenance of a large depth of focus ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg
13. Scanning and Tunable Micro-Optics for Endoscopic Optical Coherence Tomography
  
  Explore IEEE Xplore Dec 6 2011 Gastroenterology , Probes
  
  The design, fabrication, and integration of micro-optical components for beam focus and steering are demonstrated in an endoscopic optical coherence tomography (OCT) system. The relevant components, a membrane-based microfluidic tunable microlens and an electrostatic 2-D scanning micromirror, are fabricated using silicon and polymer-based microelectromechanical system technologies. All components are assembled inside a 4.5 $muhbox{m}$ diameter probe. The design of the optical system, including substantiation of the need for ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg Luc Froehly
14. Integrated three-dimensional scanner for endoscopic optical coherence tomography
  
  Explore SPIE Digital Library May 14 2010 Gastroenterology
  
  Numerous optical imaging techniques have been developed for clinical diagnostics; among these, optical coherence tomography (OCT) has proven to be of considerable utility due to its ability to non-destructively image below the surface of tissue. Endoscopic OCT systems will further extend the capabilities of this approach but require an additional means for scanning in two or three dimensions. We present an integrated optical microsystem which allows scanning of an optical ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg FEMTO-ST Institute Luc Froehly
15. OCT imaging with high lateral resolution using a dynamically focusing multi-lens system
  
  Explore SPIE Digital Library Jul 13 2009
  
  This article studies the combination of the time-domain OCT modality with a dynamically-focusing micro- lens-system. Combining the tunable lens with a fix-focal lens in the sample arm of the OCT setup shows a considerable improvement on the OCT image quality, mainly, the lateral resolution and the signal-to-noise ratio. We present an experimental method and the related first measurements of the lateral resolution of the OCT system using the tunable lens ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg
16. Fabrication of thin and flexible PDMS membranes for biomechanical test applications
  
  Explore SpringerLink Home Feb 4 2009
  
  For continuous analysis of mechanical properties of soft biological tissues during mechanical stimulation we developed a bioreactor to apply controlled periodic deflection to a probe. The probe attached on an elastic membrane produces a counterpressure if a certain gas volume is applied to the pressure chamber under the membrane. The related counterpressure-volume relationship describes the mechanical properties of the membrane-probe combination. To improve the signal-to-noise ratio of measurements the use ...
  Read Full Article
  
  Comment
  
  Mentions: University of Freiburg Dresden University of Technology Edmund Koch
17. 1-15 of 18 1 2 »